Capecitabine (NX) Versus Docetaxel Plus Capecitabine (TX) as 1-line Chemotherapy on Metastatic Breast Cancer (MBC)

We designed the randomized non-inferiority study. Main Inclusion\& exclusion Criteria include: 1) Histologically or cytologically confirmed breast cancer with unresectable locally advanced and/or metastatic disease; 2) Untreated patients with unresectable locally advanced and/or metastatic disease; 3) with at least 1 lesion measurable by radiological method(RECIST criteria); 4) Karnofsky Performance Status(KPS)≥70; 5) normal Adequate hepatic, renal, and bone marrow function; 6) Life expectancy of at least 12 weeks; 7) No previous chemotherapy for metastatic breast cancer. Primary endpoint is Progression free survival(PFS), second endpoint are safety profiles (National Cancer Institute-Common Toxicity Criteria 3.0, NCI-CTC 3.0), overall survival and response rate. During Primary study treatment, Arm A: Capecitabine: 1,000 mg/m2 per ora(PO) twice daily (day 1-14), Vinorelbine 25 mg/m2 intravenous(IV) over 3 hours on day 1 and 8, every 3 weeks, 21 days as one cycle and 6-8 cycles are required; Arm B: Capecitabine: 1,000 mg/m2 PO twice daily (day 1-14), Docetaxel 75 mg/m2 IV over 3 hours on day 1, every 3 weeks, 21 days as one cycle and 6-8 cycles are required. Patients who are responding (complete or partial), or whose disease is stable followed by Capecitabine: 1,000 mg/m2 PO twice daily (day 1-14) 21 days as one cycle until progression or unacceptable toxicity